Add new checker-specific attribute 'objc_ownership_returns'. This isn't hooked
up to the checker yet, but essentially it allows a user to specify that an
Objective-C method or C function returns an owned an Objective-C object.

llvm-svn: 70001
diff --git a/clang/lib/Parse/AttributeList.cpp b/clang/lib/Parse/AttributeList.cpp
index 5797a15..3371589 100644
--- a/clang/lib/Parse/AttributeList.cpp
+++ b/clang/lib/Parse/AttributeList.cpp
@@ -133,6 +133,10 @@
   case 18:
     if (!memcmp(Str, "warn_unused_result", 18)) return AT_warn_unused_result;
     break;
+  case 22:
+    if (!memcmp(Str, "objc_ownership_returns", 22))
+      return AT_objc_ownership_returns;
+    break;
   }
   return UnknownAttribute;
 }